ABSTRACT
Rotational fluid flows occur in a variety of technical contexts. In atmospheric and ocean rotation plays an important role. In a rotating system, changes in angular velocity with the time affects the flow pattern appreciably. The transition from laminar to turbulent nature of the flow is due to the disturbances experienced by the flow. When a small disturbance is introduced to a laminar boundary layer, the disturbance either gets amplified or damped out depending on the Reynolds number. As the name implies, reverse transition is a process in which a turbulent flow changes over to a laminar nature. Measurements near the wall do contain some errors due to the displacement effect. When the probe is very close to the wall, the flow in front of the pitot tube is disturbed and some local separation takes place. In fluid flow analysis, a majority of the problems are dealt with in a fixed or inertial coordinate system.
